Brookes and a second senior Surrey Police officer were arrested in January 2012. They were both suspended from duty while the investigation was carried out and the matter was referred to the Independent Police Complaints Commission (IPCC).

No criminal proceedings were taken against the second officer, although they remain suspended from duty pending an internal misconduct hearing, due to take place in April.

Following IPCC advice, the case was locally managed with an officer from Sussex Police, working with Surrey's professional standards department, appointed to lead on the investigation to provide an independent view of the case.

In November 2012, Brookes appeared before a gross misconduct hearing and was dismissed without notice from the force.

Assistant Chief Constable Gavin Stephens said: "We expect the highest standards of conduct from all of our employees and this kind of behaviour has no place in Surrey Police.

"The vast majority of our officers and staff who serve the people of this county are professional and hard-working and the public rightly trust them to act with integrity at all times.

"We will not hesitate to thoroughly investigate any evidence of wrongdoing and take swift action if any officer is involved in criminality.

"This was a complex investigation but thanks to the painstaking work of the officers involved, the scale of offending behaviour by Tanya Brookes was uncovered."